Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual percentual da eleição parlamentar o partido dos aposentados recebeu?
 ###Tabelas: CREATE TABLE main_towns_cities_served (main_towns_cities_served_id AUTO_INCREMENT PRIMARY KEY, Place VARCHAR, Population INT, Ceremonial County VARCHAR, Main Railway station VARCHAR, Motorway junction VARCHAR) CREATE TABLE notable_final_matches (notable_final_matches_id AUTO_INCREMENT PRIMARY KEY, Opponent VARCHAR, Res. VARCHAR, Class VARCHAR, Score VARCHAR, Date VARCHAR, Competition VARCHAR, Notes VARCHAR) CREATE TABLE doubles_titles_4 (doubles_titles_4_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score VARCHAR) CREATE TABLE team_roster (team_roster_id AUTO_INCREMENT PRIMARY KEY, Nationality VARCHAR, Player VARCHAR, Birth date VARCHAR, Height INT, Position VARCHAR) CREATE TABLE non-parliamentary_parties (non-parliamentary_parties_id AUTO_INCREMENT PRIMARY KEY, English party name VARCHAR, Norwegian party name VARCHAR, Associated ideology VARCHAR, Current leader VARCHAR, International affiliation VARCHAR, 2013 Parliamentary election VARCHAR, County councils ( 2011 ) INT)  
SELECT 2013 Parliamentary election FROM non-parliamentary_parties WHERE English party name = Pensioners Party